Transformers
Transformer Equipments
Our comprehensive range includes transformer bushings, Buchholz relays, dehydrating breathers, pressure relief valves, oil level gauges, temperature indicators, and other essential transformer components.
Whether you need solutions for oil-immersed transformers or dry-type transformers, we provide durable, standards-compliant equipments that ensure safety, efficiency, and long service life. All products are manufactured to international quality standards and widely used in power plants, renewable energy projects, industrial facilities, and electrical networks.
Explore our full collection of transformer spare parts and maintenance accessories to optimize performance and minimize downtime. Trusted by engineers and procurement professionals worldwide for superior quality and competitive pricing.
Single Phase Automatic Step Voltage Regulator
The Single-phase Automatic Step Voltage Regulator is an advanced, intelligent voltage stabilization device designed to automatically correct voltage fluctuations and deliver stable output for sensitive electrical equipment. Utilizing a high-efficiency toroidal or laminated core with premium copper windings and multiple tap positions, this regulator provides fast, precise step-type voltage correction (±10% to ±30% input range) with response times under 1 second. It features a microprocessor-based digital controller with LCD display, multiple protection functions (over-voltage, under-voltage, overload, short-circuit, and surge), and automatic bypass capability. Built with robust construction and high overload capacity (up to 200% for short durations), it ensures reliable performance in varying load conditions while maintaining low waveform distortion and high efficiency (>98%). Ideal for single-phase 220V/230V/240V systems, this voltage regulator is widely used in residential, commercial, and light industrial applications to protect equipment from unstable grid voltage and extend service life.
Step Voltage Regulator for Overhead Line & Substation | Automatic On-Load Tap Changer
The Step Voltage Regulator for Overhead Line & Substation is a high-performance, automatic on-load tap-changing device engineered to maintain stable voltage levels in fluctuating distribution networks. Utilizing premium copper windings, high-permeability silicon steel cores, and a motorized on-load tap changer, this regulator delivers precise ±10% to ±20% voltage correction with fast response and minimal waveform distortion. It features an advanced microprocessor-based AVR controller with remote communication capability (RS485/GSM/4G), real-time monitoring, and multiple protection functions including over-voltage, under-voltage, overload, and reverse power. Designed for both pole-mounted overhead line installation and substation applications, it offers excellent overload capacity, low losses, and long service life under harsh outdoor conditions. Fully sealed, oil-immersed construction with advanced corrosion protection ensures reliable operation in tropical, coastal, or heavily polluted environments while complying with IEC 60076-21 and ANSI C57.15 standards.
Single Phase Step Voltage Regulator for Substation
The Single Phase Step Voltage Regulator for Substation is a precision-engineered, automatic on-load tap-changing device designed to deliver stable voltage output in medium-voltage substation environments. Built with high-quality copper windings, premium grain-oriented silicon steel core, and a reliable motorized on-load tap changer, it provides fast and accurate voltage correction with minimal waveform distortion. The advanced digital AVR controller offers real-time monitoring, programmable settings, and multiple communication protocols for seamless SCADA integration. This regulator features robust protection systems against over-voltage, under-voltage, overload, short-circuit, and lightning surges. Its compact substation-optimized design, excellent overload capacity, and long-term reliability make it the ideal solution for maintaining consistent voltage levels despite load variations or grid fluctuations. Fully compliant with IEC 60076-21 and ANSI C57.15 standards, it ensures high efficiency, low losses, and trouble-free operation in demanding substation conditions.
SVR-3 Type Feeder Automatic Step Voltage Regulator
The SVR-3 Type Feeder Automatic Step Voltage Regulator is an advanced, three-phase on-load automatic voltage regulation system designed specifically for distribution feeders. Equipped with a high-speed motorized on-load tap changer, premium copper windings, and low-loss silicon steel core, it delivers precise and rapid voltage stabilization with minimal waveform distortion. The intelligent microprocessor controller continuously monitors line voltage and automatically adjusts taps to maintain stable output voltage, even under rapidly changing load conditions. Built for harsh outdoor environments, the SVR-3 features a fully sealed oil-immersed tank with excellent corrosion protection, advanced cooling system, and comprehensive protection functions including over-voltage, under-voltage, overload, short-circuit, and reverse power protection. With remote monitoring capability and high overload capacity, the SVR-3 significantly improves power quality, reduces energy losses, and enhances reliability across distribution networks.
SVR-3 Type Three Phase Automatic Step Voltage Regulator
The SVR-3 Type Three Phase Automatic Step Voltage Regulator is a state-of-the-art on-load tap changing device engineered to provide precise, automatic voltage stabilization for medium-voltage distribution networks. Featuring premium copper windings, high-permeability silicon steel cores, and a fast-response motorized tap changer, the SVR-3 delivers accurate voltage correction with minimal disturbance. Its intelligent digital controller continuously monitors three-phase voltage and automatically adjusts taps to maintain stable output even under rapid load changes. Designed for harsh outdoor conditions, it offers excellent overload capability, low power loss, and comprehensive protection including over/under voltage, overload, short-circuit, and phase imbalance. With remote SCADA/GSM monitoring capability and robust sealed-tank construction, the SVR-3 significantly improves voltage profile, reduces line losses, and enhances overall power quality in distribution systems.
Three Phase Automatic Step Voltage Regulator
The Three Phase Automatic Step Voltage Regulator is a high-performance on-load tap changing device designed to automatically maintain stable voltage levels in medium-voltage distribution networks. Equipped with premium copper windings, low-loss silicon steel cores, and a reliable motorized on-load tap changer, it delivers fast, precise voltage correction with minimal waveform distortion. The intelligent digital controller continuously monitors three-phase voltage and load conditions, making real-time adjustments to ensure consistent output voltage despite fluctuations in supply or demand. Built for outdoor durability, it features a fully sealed oil-immersed tank with advanced corrosion protection, excellent overload capability, and comprehensive protection systems. This regulator significantly improves power quality, reduces line losses, and enhances equipment lifespan across distribution systems.
Three Phase Step Voltage Regulator - Distribution Voltage Stabilizer
The Three Phase Step Voltage Regulator is a high-reliability, automatic on-load tap changing device engineered to maintain stable voltage levels in medium-voltage distribution systems. Featuring premium copper windings, advanced low-loss silicon steel cores, and a fast-response motorized tap changer, it delivers precise voltage correction with excellent accuracy and minimal waveform distortion. The intelligent digital AVR controller continuously monitors three-phase parameters and automatically adjusts taps in real time to compensate for load variations and grid fluctuations. Designed for demanding outdoor environments, it offers robust overload capacity, low power losses, comprehensive protection systems, and remote monitoring capabilities. This regulator effectively improves voltage profile, reduces energy losses, and enhances the overall stability and efficiency of distribution networks.
Mobile Prefabricated Substation
The Mobile Prefabricated Substation is a fully integrated, factory-assembled power solution designed for rapid deployment in emergency, temporary, or permanent power distribution applications. Built on a robust skid or trailer-mounted platform, it combines high-voltage switchgear, cast resin or oil-immersed transformer, low-voltage switchgear, protection relays, metering, and auxiliary systems into a compact, weatherproof enclosure. This plug-and-play design enables fast installation and commissioning, significantly reducing on-site construction time. With advanced safety features, intelligent monitoring, and high reliability, the mobile substation delivers stable power supply while offering excellent flexibility for load changes and network expansions. It is ideal for utilities, industrial projects, mining operations, and events requiring quick and dependable power infrastructure.
Prefabricated Substation
The Prefabricated Substation is a fully integrated, factory-built power distribution solution that combines high-voltage switchgear, transformer, low-voltage switchgear, protection systems, metering, and auxiliary equipment into a compact, modular enclosure. Designed for rapid deployment, it significantly reduces on-site civil works, installation time, and overall project costs. Built with premium materials and advanced manufacturing techniques, these substations deliver exceptional reliability, safety, and efficiency in a weatherproof, aesthetically pleasing package. Available in both skid-mounted and containerized configurations, they support a wide range of voltages and capacities while incorporating intelligent monitoring and remote control capabilities for modern smart grid applications.In-Depth Analysis
NPC Electric transformers equipments are built to deliver high efficiency, reliable performance, and advanced safety, helping businesses reduce energy costs while ensuring stable power supply. With future-ready adaptability for renewable energy and smart grid applications, they provide a sustainable and innovative solution for today’s and tomorrow’s power needs.
Comparative Analysis of Efficiency and Loss
Compared to the industry average, NPC transformers exhibit lower losses and higher efficiency across the entire load range.
Load Efficiency Comparison(%)
No-load Loss Comparison(W)
High-efficiency Core Design
High magnetic permeability and low loss silicon steel sheets are used and processed by special process to reduce hysteresis loss and eddy current loss and improve conversion efficiency.
Improved Magnetic Permeability
+15%
Reduced Iron Loss
-28%
Multiple Protection Systems
IP65 protection grade design combines multiple protection measures such as anti-corrosion, anti-UV, anti-condensation and anti-small animal intrusion.
Waterproof Performance
IP65
Anti-Corrosion Ability
15 years+
Ultra-low Noise Technology
A special shock-absorbing structure, low-noise fans, and optimized heat dissipation design ensure operating noise is far below industry standards.
Noise Reduction
-15dB
Suitability for Residential Areas
Excellent
Intelligent Cooling System
The heat dissipation system with adaptive temperature control automatically adjusts the heat dissipation efficiency according to the load and ambient temperature to reduce energy consumption.
Heat Dissipation Efficiency
+40%
Temperature Stability
±2℃
Safety Wiring System
Insulated protective cover and anti-misoperation design ensure personnel safety during installation and maintenance and reduce accident risks
Insulation Grade
Class H
Safety Protection
IP2X
Intelligent Monitoring
An optional remote monitoring system is available to monitor operating status, temperature, load and other parameters in real time, and supports fault warning and remote diagnosis.
Data Collection Frequency
one times a minute
Fault Warning Accuracy
98%
Environmental Adaptability Analysis
NPC transformers equipments have been rigorously tested and can operate stably under various harsh environmental conditions.
Temperature Range
-40℃ ~ +75℃
Can work normally in extreme high and low temperature environments
Humidity Adaptation
0 ~ 100% RH
Including condensation environment, no frost requirement
Seismic Resistance Level
IEC 60068-2-57
Suitable for earthquake-prone areas
Altitude
≤3000m
More than special design
Why Choose Us
As a trusted partner in energy savings and the development of green energy solutions, NPC Electric has played a pioneering role in the development of national smart grids across multiple regions.
Superior Quality & International Standards
We are committed to delivering only the highest quality Transformer Equipments. All our products, including HV bushings, prefabricated transformers, HV switchgear, and voltage regulators, are manufactured under strict ISO 9001 quality management systems and fully comply with IEC, ANSI, and GB international standards. Each component undergoes rigorous testing such as power frequency withstand, partial discharge, and thermal stability tests before leaving the factory. With over 15 years of industry experience, we use premium materials like high-grade porcelain, epoxy resin, and corrosion-resistant alloys to ensure long service life and exceptional performance even in harsh environments. Choosing us means choosing safety, reliability, and peace of mind for your power projects.
One-Stop Comprehensive Solutions
We offer a complete range of Transformer Equipments and accessories under one roof. From HV bushings, Buchholz relays, and dehydrating breathers to full prefabricated transformers, HV switchgear, and voltage regulators, we provide integrated solutions for both new installations and maintenance projects. This one-stop service saves you time and cost while ensuring perfect compatibility between all components. Whether you need equipment for substations, renewable energy plants, industrial facilities, or urban power distribution, our professional team can deliver tailored packages that meet your exact technical specifications and project requirements.
Professional Technical Support & Customization
Our experienced engineering team provides full technical support throughout your project lifecycle. We offer product selection guidance, technical drawings, on-site installation support, and customized solutions according to your specific voltage, capacity, and environmental requirements. With advanced design software and a strong R&D capability, we can quickly develop special specifications for HV bushings, prefabricated transformers, and HV switchgear to meet unique project demands. Our experts are always ready to help you solve complex technical challenges in power transmission and distribution systems.
Reliable After-Sales Service
We stand behind every product we supply. Our professional after-sales team offers comprehensive warranty, rapid spare parts delivery, remote technical diagnosis, and on-site maintenance support. With a global service network and sufficient stock of common Transformer Equipments such as HV bushings and voltage regulators, we ensure minimal downtime for your operations. Many customers choose us repeatedly because of our responsive service, competitive pricing, and long-term partnership approach. We are not just a supplier — we are your trusted partner in power equipment.
Product Show
Explore the detailed design and practical application scenarios of NPC transformer equipment
Prefabricated Transformer
Prefabricated Transformer & Box Transformer
HV Bushings
Transformer Equipments - HV Bushings
LV, MV & MV Switchgear
High performance LV, MV & MV Switchgear
Electrical Transformer Coil
Electrical Transformer Coil For Power Transformer
Bushing Wells
Transformer Equipments - Bushings Well
Load Break Switcher
Transformer Equipments - Load Break Switcher
Voltage Regulator
Transformer Equipments - Single Voltage Regulator
Step Voltage Regulator
Transformer Equipments - Step Voltage Regulator
Testing and Certification
Tested with precision and certified to meet international standards as
well as strict industry requirements.
Bare Cable Test Report
SGS Inspection Report
Certificate of Acceptance
ISO Quality Certificate
ISO Environmental Certificate
ISO Occupational Certificate
UL Laboratory Certificate
UL Product Certificate
Project Cases
NPC transformers have been successfully applied in many projects and have been highly praised by customers.
Mongolia Industrial Park
CompletedProvide stable and reliable power conversion solutions for industrial parks to meet diverse production needs.
Country：Mongolia
Model：Three Phase Pad Mounted Transformer x 8
Dominican Factory
CompletedEnsure power security in nearby industrial parks and meet diverse needs
Country：Dominican
Model：NPC 450KV Power Transformer x 4
Dominican Electricity
CompletedDry-type transformers provide safe, efficient, and reliable power distribution in Dominican .
Country：Dominican
Model：NPC Dry Type Transformer x 6
Related Articles
Understand the product's characteristics, structure, and applications.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
FAQ From Customers
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What are Transformer Equipments?
Transformer Equipments refer to a wide range of accessories and components used for power transformers, including HV bushings, Buchholz relays, dehydrating breathers, temperature indicators, and oil level gauges. These essential parts ensure safe, efficient, and reliable operation of oil-immersed and dry-type transformers. -
What is an HV Bushing and why is it important?
HV Bushing (High Voltage Bushing) is a critical insulator that allows high-voltage conductors to pass through the transformer tank while maintaining electrical insulation. It prevents flashover and ensures safe power transmission. We offer premium porcelain and composite HV bushings up to 110kV. -
What is a Prefabricated Transformer?
A Prefabricated Transformer (also known as package substation or compact substation) is a factory-assembled unit that integrates transformer, HV switchgear, LV switchgear, and protection devices into one enclosure. It is widely used in urban power distribution, industrial parks, and renewable energy projects due to its compact size and fast installation. -
Do you supply HV Switchgear for transformers?
Yes. We provide HV Switchgear including SF6 gas insulated switchgear, vacuum circuit breakers, disconnectors, and load break switches. These are fully compatible with our transformers and prefabricated substations, meeting IEC standards for reliable power control and protection. -
What does a Voltage Regulator do in a transformer system?
A Voltage Regulator automatically maintains stable output voltage despite fluctuations in input voltage or load. It is commonly used with power transformers in areas with unstable grids, ensuring consistent voltage for sensitive equipment and improving overall system efficiency. -
What other Transformer Equipments do you offer?
In addition to HV bushings, HV switchgear, prefabricated transformers and voltage regulators, we also supply Buchholz relays, pressure relief valves, dehydrating breathers, magnetic oil level gauges, winding temperature indicators, and complete sets of transformer spare parts.
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